Septic Tank Services in New Hampshire

Find trusted, licensed septic companies across 9 cities in New Hampshire. Compare ratings, read reviews, and get free estimates.

🏢116Companies

📍9Cities

⭐4.7Avg Rating

Free estimate · talk to a pro now📞 Call a Septic Pro Now(844) 321-8040

🏆

Highest Rated

Top-Rated Companies in New Hampshire

Based on verified Google reviews and service quality

Jake Dawson's Excavation & Utility Services, LLC

★★★★★5(4 reviews)

📍 80 NH-16B, Center Ossipee, NH 03814

Serving Center Ossipee since 2026 (0 years)

Septic Pumping & CleaningSeptic InstallationSeptic Repair

Jake Dawson's Excavation & Utility Services, LLC is a trusted excavation contractor and septic company based in Center Ossipee, New Hampshire, serving Center Ossipee, North Conway, Wolfeboro, and the surrounding areas. The company offers a comprehensive range of services including septic excavation, septic repair, septic tank installation, basement excavation, driveway excavation, foundation digging, site preparation, trenching, earth moving, pond digging, site clearing, and both residential and commercial excavation. Jake Dawson's team brings hands-on expertise to every project, handling work of all sizes with precision and a strong commitment to customer service. Homeowners and builders throughout the region rely on the company for its professional approach, reasonable rates, and quality results. The crew works efficiently on active job sites, minimizing delays while delivering dependable earthwork and excavation outcomes. Those in need of excavation or septic services in the Center Ossipee area can reach Jake Dawson's Excavation & Utility Services, LLC by calling (603) 301-0104 to schedule a consultation.

View Profile →

🏢Is this your business? Claim this listing to manage your calls and appear at the top of results.Claim Now →

Best Septic Service

★★★★★5(28 reviews)

📍 16 Shaker Brook Park, Loudon, NH 03307

Serving Loudon since 2026 (0 years)

Septic Pumping & Cleaning

Best Septic Service provides septic tank pumping and portable toilet services in the greater Concord, New Hampshire area. Based in Loudon at 16 Shaker Brook Park, the company has been serving the local community for over 50 years. Their service area covers central New Hampshire and extends into parts of the Lakes Region for portable toilet delivery. The company operates a fleet of service vehicles and has recently expanded their portable toilet service coverage area. They can be reached at 603.2

View Profile →

🏢Is this your business? Claim this listing to manage your calls and appear at the top of results.Claim Now →

Derry Septic Service

★★★★★5(65 reviews)

📍 4 Cote Ln, Londonderry, NH 03053

Serving Londonderry since 2026 (0 years)

Septic Pumping & Cleaning

Derry Septic Service is a family-owned and operated septic service provider serving Londonderry, Bedford, Manchester, Nashua, and surrounding areas in New Hampshire. Since 1981, the company has established itself as a reliable source for comprehensive septic solutions, offering emergency septic service, pumping, repairs, inspections, and clogged drain maintenance for both residential and commercial properties. The fully licensed and insured team specializes in professional septic tank maintenance and repair with a commitment to transparent pricing and no hidden fees. Derry Septic Service distinguishes itself through decades of local experience, extensive knowledge of septic systems, and a focus on customer service. As a small local business, the company prioritizes building long-term relationships within the Derry and Londonderry communities while maintaining fair and affordable rates for all septic service needs.

View Profile →

🏢Is this your business? Claim this listing to manage your calls and appear at the top of results.Claim Now →

David O'Neil Construction

★★★★★5(16 reviews)

📍 423 Main St, Marlborough, NH 03455

Serving Marlborough since 2026 (0 years)

Septic InstallationSeptic InspectionDrain Field RepairSeptic Pumping & Cleaning

David O'Neil Construction is an excavation and septic system specialist operating in Marlborough, New Hampshire. The company provides septic system and private sewer line installations, inspections, and video camera services for homebuyers to assess system conditions before purchase. Their excavation services include designing and installing new septic systems, creating new driveways with hard pack or asphalt grindings, developing new house lots from clearing through final grading, installing un

View Profile →

🏢Is this your business? Claim this listing to manage your calls and appear at the top of results.Claim Now →

📍

Local Coverage

Browse Septic Services by City

9 cities with septic service providers in New Hampshire

No cities starting with “A”

→Drag to explore or use arrows

New Hampshire Service Map

9 cities with verified providers

🗺️

Statewide

Browse Septic Services by County in New Hampshire

9 counties with septic providers across New Hampshire

Browse septic services by county across New Hampshire.

⚙️

What We Cover

Popular Services in New Hampshire

Find specialized septic service providers across New Hampshire

💧

📖

Resources

Septic Guides & Resources

Expert guides to help New Hampshire homeowners maintain their septic systems

New Hampshire Septic Regulations

⚖️ State Guide • Permits, Setbacks & Inspections

How Often to Pump Your Septic Tank

📖 Pillar Guide • 21 min read

Complete Septic Maintenance Guide

📖 Pillar Guide • 16 min read

What Is a Drain Field?

📖 Pillar Guide • 14 min read

Septic Pumping Cost Guide

💰 Cost Guide • Updated 2026

Septic Installation Cost Guide

💰 Cost Guide • Updated 2026

Signs Your Septic Tank Needs Pumping

📖 Quick Guide • 9 min read

📖

Local Guide

About Septic Systems in New Hampshire

New Hampshire's granite-heavy terrain and glacial legacy shape septic system design across the state, with 45% of homes relying on onsite wastewater treatment. From the Lakes Region to the White Mountains, properties face challenges including shallow bedrock, deep frost penetration to 48 inches, and seasonal water table fluctuations during the notorious mud season. The New Hampshire Department of Environmental Services enforces comprehensive Env-Wq 1000 rules governing system design and installation, with additional shoreland protections around the state's 1,000+ lakes and ponds. With 92 licensed providers serving 70 communities, homeowners benefit from competitive service options while navigating one of New England's most rigorous regulatory frameworks.

🏠

45%

Homes on Septic

🏢

Licensed Providers

⭐

4.6/5

Avg Service Rating

📅

Every 3-5 years

Recommended Pumping

🏛

Regulatory Authority

New Hampshire Department of Environmental Services (NHDES)

✓Env-Wq 1000 rules govern all subsurface disposal system design, installation, and operation across the state
✓Licensed septic system designer and state-approved installer certification required for all new installations and replacements
✓Shoreland protection requirements under Env-Wq 1400 mandate increased setbacks and specialized designs within 250 feet of water bodies
✓Converting seasonal lake cottages to year-round residences requires new septic permits meeting full-time occupancy standards

Inspection Rules: New Hampshire does not mandate septic inspections at property sale, though lenders and buyers frequently request them as a condition of transfer

Environmental Factors

Soil Type

High Impact

Glacial till dominates with pockets of sandy loam ideal for drainage, but frequent ledge and bedrock outcroppings near the surface force costly blasting or mounded system designs in many areas

Water Table

High Impact

Moderate water table at 3-15 feet depth rises significantly during March-April mud season when snowmelt saturates soil, creating temporary high-water conditions that stress drain fields

Climate

Medium Impact

Humid continental climate delivers 40+ inches of annual precipitation with winter temperatures regularly below zero, freezing septic lines and reducing bacterial activity in tanks during extended cold snaps

Frost Line

High Impact

Frost penetrates 48 inches deep, requiring all distribution pipes and tank connections to be buried at least 4 feet down to prevent freeze damage and system failure during January-February cold periods

Average Pumping Cost

$325 – $575per service

$200$800

Remote locations in Coos County and the North Country add significant travel fees due to distance from provider hubs like Concord and ManchesterLedge and bedrock excavation requirements can double installation costs when blasting becomes necessary for proper system depthShoreland-compliant advanced treatment systems near lakes cost $15,000-$30,000 more than conventional systems due to Env-Wq 1400 requirementsWinter access restrictions and frozen ground conditions create premium charges for emergency services during November through March

Tips for New Hampshire Homeowners

Schedule pumping before October to avoid frozen ground complications and ensure your system enters winter with maximum capacity for reduced biological activity during cold months

Document your system's location relative to property boundaries before heavy snowfall, as NHDES setback requirements to wells and water bodies must be verified during any future permit applications

Redirect roof gutters and driveway runoff away from drain fields to prevent saturation during mud season when water tables naturally rise 3-5 feet in many granite-till soils

Install septic tank risers to grade level during any pumping service, eliminating the need to dig through 48 inches of frozen soil for future winter access emergencies

❓

Common Questions

Frequently Asked Questions

About septic services in New Hampshire

Shoreland protection rules under Env-Wq 1400 mandate specialized treatment within 250 feet of water bodies to protect the state's lakes and ponds from nutrient pollution. Properties near water must install advanced systems like Presby Enviro-Septic, Advantex, or sand filters that provide tertiary treatment before effluent reaches drain fields. These systems cost $20,000-$35,000 compared to $10,000-$15,000 for conventional systems, but they're required to meet nitrogen and phosphorus removal standards that protect water quality in sensitive shoreland zones throughout the Lakes Region and Connecticut River valley.

Mud season spans March through April when winter snowpack melts rapidly while the ground remains frozen below the surface, preventing drainage. Water tables rise 3-5 feet in New Hampshire's glacial till soils, potentially flooding drain fields and preventing proper effluent percolation. Saturated drain fields can't process wastewater, causing backups or surfacing sewage. During this period, reduce water usage, avoid heavy loads of laundry, and never pump your tank unless absolutely necessary—disturbing saturated soil can cause system failure. Most experienced providers in communities like Bow and Concord refuse non-emergency service during peak mud season conditions.

Yes, NHDES requires a licensed septic system designer for all new installations and replacement systems, regardless of complexity. The designer must conduct soil evaluations, design a system meeting Env-Wq 1000 standards, and submit plans to NHDES for approval before installation begins. This requirement protects homeowners from improper systems that fail prematurely in New Hampshire's challenging glacial till and ledge conditions. Design fees typically run $1,500-$3,000, but this ensures your system accounts for local water table depth, frost penetration, and any shoreland protection requirements. Only the designer and a state-approved installer can legally complete your project.

Unlikely. NHDES requires a new septic permit when converting seasonal properties to year-round residences because occupancy patterns change dramatically. A summer cottage system designed for weekend use and 2-3 month seasonal occupancy cannot handle the daily wastewater volume of full-time living, especially during winter when biological treatment slows in cold temperatures. The conversion triggers current code compliance, meaning your system must meet modern Env-Wq 1000 standards including proper frost-depth burial at 48 inches and potentially shoreland protection requirements if you're near water. Plan for a complete system replacement costing $15,000-$40,000 depending on site conditions and proximity to lakes or ponds.

New Hampshire's granite bedrock often lies just 2-4 feet below surface across much of the state, particularly in the White Mountains region and central areas around Concord. Env-Wq 1000 rules require distribution pipes buried at the 48-inch frost line depth, but ledge prevents standard excavation. Contractors must bring in specialized rock-breaking equipment or explosives, with blasting permits costing $500-$1,500 and excavation rates jumping from $50 to $200+ per cubic yard. Alternatively, properties install above-grade mounded systems that avoid ledge but require imported fill material—typically 100-200 yards at $30-$50 per yard delivered. Either solution adds $8,000-$15,000 to conventional installation costs.

🏛️

Official Resources